Add sorting by reference

[LameuleFR]

Questions	Answers
Description?	Add sorting by reference in the prestashop categorie page.
Type?	improvement
BC breaks?	no
Deprecations?	no
Fixed ticket?
How to test?	Check that on the category with filters there is a new sorting option available

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This change is 

[mflasquin]

LGTM

[florine2623]

@LameuleFR ,

Do you have an issue/discussion related ? If so, please add the link to your PR description.
If not, please describe How to test your PR description.

[LameuleFR]

Hi @florine2623

There is no issue or discussion but this is a common demand as merchant.

To test, go to a category page and click on the sort button. You will see the choice of sorting by reference
https://i.gyazo.com/3a84b67f11918e0e42a6c12001464588.png

[MhiriFaten]

Hello @LameuleFR ,

I have checked your PR and the sorting by reference is well added in the PrestaShop category page and works as expected.

LGTM 🟢

It is QA approved !
Thanks.

[kpodemski]

thank you @LameuleFR

[jf-viguier]

Some merchants don't use references, so this sorting is not relevant for them.

[LameuleFR]

In most case merchant will use references but we can probably add a configuration field in the module to activate/deactivate this behaviour.

[kpodemski]

@LameuleFR It would be great to have a simple configuration for every sort option 👍🏻